Well, it is very hard to say that reading in bed is bad for your eye health. Different people have different opinion . As I know, there are many people who are reading book in their bed and even don't care anything about their eyes, but they still have good vision. In other words, it kind of depends on your eye gene. On the other hand, you should also pay more attention to your reading habits. For example, you'd better not read a book in a dark place. Besides, the position and the distance of your reading are also very important, so just be careful about them. So that you can not damage your eyes,